Toolset for computations involving date and time values in the shell, with a strong focus on usability within shell scripts.
Their target market are shell scripts that need date calculations and/or calendar conversion, and as such they are highly pipe-able and modelled after their well-known (non-date-aware) cousins:
+ dseq (vs. seq)
+ dgrep (vs. grep)
+ dtest (vs. test)